That's impressive... What was the hardware cost?

I am using my gaming PC that I built years ago and a $1079/mo dual hexacore dual Tesla M2090 server from Softlayer.

Fortunately I have a $1k/mo Softlayer credit, so my hardware costs were approximately $79. My rent includes electricity, so my electricity costs were $0.

Don't people abuse the 'electricity is in the rent' fact? Or is it a (shared) tragedy of the commons problem?